简介：Aggregatesignaturesareausefulprimitivewhichallowsaggregatingmanysignaturesondifferentmessagescomputedbydifferentusersintoasingleandconstant-lengthsignatureandadaptstoMobileAdhocNETwork(MANETs)verymuch.JuminSong,etal.presentedanID-basedaggregatesignature,appliedittoMANETsandproposedasecureroutingscheme.Inthiswork,weanalyzeJuminSong,etal.’saggregatesignatureschemeandfindsomelimitationsonitsbatchverification.Inaddition,inthiswork,weapplyCraigGentry,etal.’sID-basedaggregatesignaturetoon-demandroutingpro-tocoltopresentasecureroutingscheme.Ourschemenotonlyprovidessoundauthenticationandasecureroutingprotocolinadhocnetworks,butalsomeetsthenatureofMANETs.

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简介：Withouttheassumptionthattheprivatekeysarekeptsecureperfectly,cryptographicprimitivescannotbedeployedintheinsecureenvironmentswherethekeyleakageisinevitable.Inordertoreducethedamagecausedbythekeyexposureintheidentity-based(ID-based)signaturescenariosefficiently,weproposeanID-basedkey-insulatedsignatureschemeinthispaper,whicheliminatestheexpensivebilinearpairingoperations.Comparedwiththepreviouswork,ourschememinimizesthecomputationcostwithoutanyextracost.Underthediscretelogarithm(DL)assumption,asecurityproofofourschemeintherandomoraclemodelhasalsobeengiven.

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简介：In2010,Hwang,etal.proposeda'DoS-resistantID-basedpasswordauthenticationschemeusingsmartcards'asanimprovementofKim-Lee-Yoo's'ID-basedpasswordauthenticationscheme'.Inthispaper,wecryptanalyzeHwang,etal.'sschemeandpointoutthattherevealedsessionkeycouldthreatthesecurityofthescheme.Wedemonstratethatextractinginformationfromsmartcardsisequaltoknowingthesessionkey.Thusknownsessionkeyattacksarealsoeffectiveundertheas-sumptionthattheadversarycouldobtaintheinformationstoredinthesmartcards.WeproposedanimprovedschemewithsecurityanalysistoremedytheweaknessesofHwang,etal.'sscheme.Thenewschemedoesnotonlykeepallthemeritsoftheoriginal,butalsoprovidesseveraladditionalphasestoimprovetheflexibility.Finally,theimprovedschemeismoresecure,efficient,practical,andconvenient,becauseellipticcurvecryptosystemisintroduced,theexpensivesmartcardsandsynchronizedclocksystemarereplacedbymobiledevicesandnonces.